Let me ask the question first and explain the context after that.
Is it possible to hint TTF in a way that would make a glyph render 1 pixel wider (at certain pixel size) than its unhinted version?
I figured out how to do it in Firefox and Chrome. In the IE I can detect CT in some cases, but not always and this relies on using Flash, which makes it am untidy hack. Here's a thread where it all started.
One option that I'd like to explore is making a custom single-glyph TTF font and then hinting for ClearType so that the glyph would render with a different width depending on whether the CT is enabled. This difference can be detected by CSS and so I have my solution.
I have very rudimentary undertsanding of hinting, and I am looking for a simple "yes, possible" / "no, not possible" guidance. If it is possible, I will look into the hinting subject at detail and figure things out.